package com.hmall.gateway.filters;


import com.hmall.common.exception.UnauthorizedException;
import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.utils.JwtTool;
import lombok.AllArgsConstructor;
import lombok.RequiredArgsConstructor;

import org.checkerframework.checker.units.qual.A;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

@Component
@RequiredArgsConstructor

public class AuthGlobalFilter  implements GlobalFilter, Ordered {
    private  final AuthProperties authProperties;
    private  final JwtTool jwtTool;


    private  final AntPathMatcher antPathMatcher=new AntPathMatcher();
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1. 获取请求路径 request
        ServerHttpRequest request = exchange.getRequest();
        // 2. 判断是否需要拦截
        if (isExcludePath(request.getPath().toString())) {
            return chain.filter(exchange);
        }
        //3. 获取token
        String token = null;
        List<String> authorization = request.getHeaders().get("authorization");
        if (authorization != null && !authorization.isEmpty()) {
            token = authorization.get(0);
        }
        //4. 解析token
        Long userId=null;
        try{
        userId = jwtTool.parseToken(token);

         }catch (UnauthorizedException e){
            //拦截，给出响应状态码 401
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        String userInfo= userId.toString();
        ServerWebExchange serverWebExchange = exchange.mutate().request(builder -> builder.header("user-info", userInfo)).build();
        //6 . 放行
        return chain.filter(serverWebExchange);
    }

    private boolean isExcludePath(String string) {
       for(String pattern: authProperties.getExcludePaths()){
           if(antPathMatcher.match(pattern,string)){
               return true;
           }
       }
        return false ;
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
